What is the most efficient way to increase mileage on a Audi A4?

I recently bought an Audi A4 and have been looking for ways to increase my gas mileage. I have heard of various techniques and modifications, but I'm not sure which one is the most effective. What are some proven methods to improve the mileage on an Audi A4?

One of the best ways to improve gas mileage on an Audi A4 is to regularly maintain and replace your air filter. A clean air filter can lead to better fuel efficiency, as it allows for proper air flow to the engine. Additionally, try to drive at a steady speed and avoid sudden accelerations or decelerations. This can also improve your gas mileage.